I'm working on this that I got from ebay. It's pretty old and the block is thin, with large mouth opening in spite of having had a filler piece fitted.
Thinking of adding 5/16" to the sole, which should move the blade and chip breaker down, improving the fit.
I haven't seen this done, 'tho I do have a grooving plane with corner pieces let in, and a plane with plastic laminate added to the sole.

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